diff --git a/src/include/ucd/ucd.h b/src/include/ucd/ucd.h
index d5aca375..cd130a5b 100644
--- a/src/include/ucd/ucd.h
+++ b/src/include/ucd/ucd.h
@@ -348,6 +348,7 @@ typedef enum ucd_property_
 	UCD_PROPERTY_NONCHARACTER_CODE_POINT = 0x00010000, /**< @brief Noncharacter_Code_Point */
 	UCD_PROPERTY_OTHER_GRAPHEME_EXTEND   = 0x00020000, /**< @brief Other_Grapheme_Extend */
 	UCD_PROPERTY_IDS_BINARY_OPERATOR     = 0x00040000, /**< @brief IDS_Binary_Operator */
+	UCD_PROPERTY_IDS_TRINARY_OPERATOR    = 0x00080000, /**< @brief IDS_Trinary_Operator */
 } ucd_property;
 
 /** @brief Return the properties of the specified codepoint.
@@ -826,6 +827,7 @@ namespace ucd
 		Noncharacter_Code_Point = UCD_PROPERTY_NONCHARACTER_CODE_POINT, /**< @brief Noncharacter_Code_Point */
 		Other_Grapheme_Extend = UCD_PROPERTY_OTHER_GRAPHEME_EXTEND, /**< @brief Other_Grapheme_Extend */
 		IDS_Binary_Operator = UCD_PROPERTY_IDS_BINARY_OPERATOR, /**< @brief IDS_Binary_Operator */
+		IDS_Trinary_Operator = UCD_PROPERTY_IDS_TRINARY_OPERATOR, /**< @brief IDS_Trinary_Operator */
 	};
 
 	/** @brief Return the properties of the specified codepoint.
diff --git a/src/proplist.c b/src/proplist.c
index 00ff48c9..02493bfa 100644
--- a/src/proplist.c
+++ b/src/proplist.c
@@ -1516,6 +1516,7 @@ static int properties_So(codepoint_t c)
 		break;
 	case 0x2F00:
 		if (c >= 0x2FF0 && c <= 0x2FF1) return UCD_PROPERTY_IDS_BINARY_OPERATOR;
+		if (c >= 0x2FF2 && c <= 0x2FF3) return UCD_PROPERTY_IDS_TRINARY_OPERATOR;
 		if (c >= 0x2FF4 && c <= 0x2FFB) return UCD_PROPERTY_IDS_BINARY_OPERATOR;
 		break;
 	case 0x01F100:
diff --git a/tools/printdata.py b/tools/printdata.py
index 8fb31c69..2a2c3add 100755
--- a/tools/printdata.py
+++ b/tools/printdata.py
@@ -140,6 +140,7 @@ def properties(data):
 	props += (2 ** 16) * data.get('Noncharacter_Code_Point', 0)
 	props += (2 ** 17) * data.get('Other_Grapheme_Extend', 0)
 	props += (2 ** 18) * data.get('IDS_Binary_Operator', 0)
+	props += (2 ** 19) * data.get('IDS_Trinary_Operator', 0)
 	return props
 
 if __name__ == '__main__':